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Derivative Financial Instruments (Summary Of Derivative Instruments Designated As Hedging Instruments) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Fair Value	$ 61	$ 30
Notional Amount	$ 150,000	150,000
Interest Rate Cap [Member]
Derivative [Line Items]
Interest Rate Strike	4.00%
August 2021 Term Loan [Member] | Interest Rate Cap, Maturity Date April 1, 2019 [Member]
Derivative [Line Items]
Effective Date	Sep. 01, 2015
Maturity Date	Apr. 01, 2019
Interest Rate Strike	4.00%
Fair Value		1
Notional Amount	$ 50,000	50,000
January 2022 Term Loan [Member] | Interest Rate Cap, Maturity Date May 1, 2021 [Member]
Derivative [Line Items]
Effective Date	Dec. 01, 2014
Maturity Date	May 01, 2021
Interest Rate Strike	4.00%
Fair Value	$ 57	26
Notional Amount	$ 50,000	50,000
January 2022 Term Loan [Member] | Interest Rate Cap, Maturity Date February 3, 2020 [Member]
Derivative [Line Items]
Effective Date	Sep. 01, 2015
Maturity Date	Feb. 03, 2020
Interest Rate Strike	4.00%
Fair Value	$ 4	3
Notional Amount	$ 50,000	$ 50,000

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

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- Definition

Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611

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- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

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